ci: seed loader smoke with prerelease SDK

Author: alex-w-99

.github/workflows/tests.yml

@@ -78,4 +78,4 @@ jobs:
             ./.ci/inkbox/sdk/typescript \
             @opencode-ai/sdk@1.17.18 @opencode-ai/plugin@1.17.18
       - run: npm install -g opencode-ai@latest
-      - run: bash scripts/smoke-loader.sh
+      - run: INKBOX_SDK_PATH="$PWD/.ci/inkbox/sdk/typescript" bash scripts/smoke-loader.sh

scripts/smoke-loader.sh

@@ -25,7 +25,11 @@ echo "==> creating throwaway project in $WORKDIR"
 cd "$WORKDIR"
 git init -q .
 npm init -y >/dev/null
-npm install --silent "$TARBALL"
+if [ -n "${INKBOX_SDK_PATH:-}" ]; then
+  npm install --silent "$INKBOX_SDK_PATH" "$TARBALL"
+else
+  npm install --silent "$TARBALL"
+fi
 
 mkdir -p .opencode/plugins
 # The wrapper loads the packaged plugin exactly as opencode would, then drops